Handle for toothbrush or flossing aid



FIG. 1 is a perspective view of an ornamental design for a handle for toothbrush or flossing aid showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a right end view thereof; and

FIG. 5 is a left end view thereof. 

The ornamental design for a handle for toothbrush or flossing aid, substantially as shown and described. 